Second real cut, was going great until one particular spot on a circle

I’ve solved this problem a long time ago…
The drivers are overheating!
Those tiny heatsinks are useless, I replaced mine with some copper sheet bent into U shapes then put a stick on the other side of the Arduino to hold them down with some electrical tape. A box fan blowing on them solved this problem. It was a quick patch that I haven’t gotten around to making pretty yet. That’s why your first cuts work fine. The unit is cold. Cutting fast or near the top center heats the controllers up quickly.

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